The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 29, 1990
Filed:
Jun. 02, 1988
Freerk R van Calker, Lathum, NL;
Antonius W Ter Burg, Arnhem, NL;
Akzo NV, Arnhem, NL;
Abstract
A conveyor belt, which has a high strength, tear resistance and flame retardancy, and which is particularly suitable for use in coal mines. It comprises a matrix of thermoplastic resinous material, e.g., PVC, reinforced with an armouring comprising a layer of primary tension elements extending substantially rectilinearly in the longitudinal direction of the belt and consisting of continuous filaments, and covering layers consisting of yarns or threads disposed on both sides of the primary tension elements so as to impart coherence in the transverse direction of the belt, the top and bottom covering layers being connected by tying yarns or threads. The primary tension elements are composed of cables or cords of aramid. Adjacent primary tension elements are separated by gaps having a width of 0.5 to 3 times, more particularly 2 times the outer diameter of the primary tension elements. The gaps are filled up with one or more elements such as, e.g., cotton cables or cords.